Bugfix startup when user doesn't have write permission to SSW

[samaloney]

Addresses the crash mentioned in #234 but not the underling issue.

Output from SSW startup when the stix_conf_version.txt file is missing and user doesn't have write access e.g. after and saw_upgrade.

Executing SSW IDL_STARTUP for: STIX
% Compiled module: STX_CHECK_CONFIG_FILES.
% Compiled module: HAVE_NETWORK.
% Compiled module: URL_FIX.
% Compiled module: HAS_URL_SCHEME.
% Compiled module: URL_PARSE.
% Compiled module: IS_NUMBER.
% Compiled module: IS_STRUCT.
% Compiled module: SOCK_CHECK.
% Compiled module: SOCK_HEAD.
% Compiled module: IS_URL.
% Compiled module: IS_FTP.
% Compiled module: IS_SSL.
% Compiled module: IDLNETURL2__DEFINE.
% Compiled module: HTTP_PROXY.
% Compiled module: IS_NUMBER2.
% Compiled module: SOCK_IDL_AGENT.
% Compiled module: USE_PROXY.
% Compiled module: HAVE_PROXY.
% Compiled module: SOCK_CODE.
% Compiled module: SOCK_CONTENT.
% Compiled module: SOCK_CONTENT_HTTP.
% Compiled module: BYTE2STR.
% Compiled module: SOCK_ERROR.
% Compiled module: SOCK_DECODE.
% Compiled module: MERGE_STRUCT.
% Compiled module: LOC_FILE.
% Compiled module: TRIM2.
% Compiled module: CHKLOG.
% Compiled module: FIX_SLASH.
% Compiled module: BREAK_FILE.
% Compiled module: TEST_OPEN.
% Compiled module: SOCK_COPY.
% Compiled module: REM_DUP_KEYWORDS.
% Compiled module: SOCK_GET.
% Compiled module: CURDIR.
% Compiled module: IS_MEMBER.
% Compiled module: MPRINT.
% Compiled module: GET_CALLER.
% Compiled module: STRPAD.
% SOCK_GET_MAIN: No write access to directory - /usr/local/ssw/so/stix/dbase/detector
% STX_UPDATE_DET_CONFIG_FILES: Warning congiguration file elut_index.csv not found.
% SOCK_GET_MAIN: No write access to directory - /usr/local/ssw/so/stix/dbase/detector
% STX_UPDATE_DET_CONFIG_FILES: Warning congiguration file science_echan_index.csv not found.
% Compiled module: STR2FILE.
% Compiled module: FILE_BREAK.
% Compiled module: COMDIM2.
% STR2FILE: Denied write privilege for file: /usr/local/ssw/so/stix/dbase/detector/stix_conf_version.txt

[samaloney]

Could use a test by someone else on a different install and ideally platform (not macOS)